package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import io.swagger.util.Json;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;


@Service
public class UserServiceImpl implements UserService {

    //定义常量 微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;


    /**
     * 微信登录 和以前不一样 首先不用查表验证
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

       String openid = getOpenId(userLoginDTO.getCode());//抽离出来了

        //判断openid是否为空，如果为空表示登录失败
        if (openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是不是新用户
        User user = userMapper.getByOpenId(openid);

        //如果是新用户，自动完成注册
        if (user == null){

             user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())  //user表里面没有updatetime，使用AOP回抛异常
                    .build();
        //如果是新用户 构建数据插入表内（完成注册
            userMapper.insert(user);
        }
        //返回这个用户对对象
        return user;
    }


    /**
     * 调用微信接口服务，获得当前微信用户的openid
     * @param code
     * @return
     */

    private String getOpenId(String code){
        //调用微信接口服务，获得当前微信用户的openid httpcilent
        HashMap<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);//发送服务 获取json数据（有openid）

        //从json中拿出openid
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");//解析出openid
        return openid;

    }
}
